fix the build.

Change-Id: I3f483d861a3f6388907d3254428b46701963ee55
diff --git a/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java b/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
index 6838dda..8cd5803 100644
--- a/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
+++ b/packages/SystemUI/src/com/android/systemui/recent/RecentApplicationsActivity.java
@@ -163,6 +163,9 @@
                 });
             }
         }
+
+        public void onReportFirstCardPosition(int n) {
+        }
     };
 
     private final IThumbnailReceiver mThumbnailReceiver = new IThumbnailReceiver.Stub() {